Archived posting to the Leica Users Group, 2004/09/30

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Subject: [Leica] Consider This...
From: feli at (Feli di Giorgio)
Date: Thu Sep 30 15:02:58 2004
References: <> <> <00bb01c4a72d$74a39120$4649c33e@eigenaarsgmw7j>

On Thu, 2004-09-30 at 13:38, animal wrote:
> How to make a coke bottle behave like a summicron
> best regards
> simon jessurun

Yes, but again all of these operations involve sub-pixel transformations
to the image. Sub-pixel transformations are operations where a pixel is 
moved a fraction of a pixel. You can't really do that, so you have 
to interpolate the data and every time you perform one of these operations
you cut the resolution of your image data in half. So yes, the image will
no longer show the effect of the barrel/pincushion distortion, but it will 
have taken a hit in the sharpness department. How big that hit is, depends 
on how sophisticated the filtering algorithms are in your software. There 
is no magic software bullet that will fix these problems. Software fixes 
like this aren't a substitute for a good lens. To quote my old boss:
"You can't make chicken salad, out of chicken shit."

Color correction is a whole different ballgame and is far less destructive
than a transformation operation


In reply to: Message from attinasi at (Marc Attinasi) ([Leica] Consider This...)
Message from feli2 at (feli) ([Leica] Consider This...)
Message from s.jessurun95 at (animal) ([Leica] Consider This...)